Anticipatory activation of postural muscles associated with bilateral arm flexion in subjects with different quiet standing positions

Fujiwara, Katsuo; Toyama, Hiroshi; Kunita, Kenji

doi:10.1016/s0966-6362(02)00100-5

Cited by 45 publications

(50 citation statements)

References 37 publications

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“…Second, APAs are reportedly modulated by CoP position before voluntary movement (Benvenuti et al 1997;Fujiwara et al 2003). In the present study, the initial CoPy position was significantly more anterior in the SDCP group than in the control group, suggesting a larger stability margin in the backward direction in the participants with SDCP.…”

Section: Discussionsupporting

confidence: 48%

“…a, Metal frame; b, infrared camera; c, metal wires; d, accelerometer; e, load; f, surface electrode; g, reflective marker; h, force platform. (Benvenuti et al 1997;Fujiwara et al 2003). To minimize intertrial differences in APAs due to differences in CoP position before the load release, a buzzing sound, which was generated by a computer (PP21L, Dell, Round Rock, TX) connected to the force platform, was used to inform participants if they were maintaining CoPx and CoPy positions within a range of Ϯ1.5 cm of the quiet standing position.…”

Section: Methodsmentioning

confidence: 99%

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Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

Tomita

Fukaya²,

Totsuka

et al. 2013

Journal of Neurophysiology

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Section: Discussionsupporting

confidence: 48%

Section: Methodsmentioning

confidence: 99%

Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

Tomita

Fukaya²,

Totsuka

et al. 2013

Journal of Neurophysiology

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“…However, individual differences were observed in the muscle activities of the trunk and thigh during floor oscillation. 13 In the posterior-dominant subject, this dominance was maintained in the trunk and thigh during floor oscillation, and activity of these muscles tended to increase at higher oscillation frequencies. At both oscillation frequencies, alternating action of anterior and posterior muscles was rarely observed, and periodicity of activity corresponding to oscillation frequency was observed in the posterior muscles.…”

Section: Resultsmentioning

confidence: 96%

“…When an individual moves the arm while standing at rest, postural muscle activity precedes activity of the arm target muscles [5,28]. We reported that onset timing of postural muscle activation was adjusted depending on quiet standing position [12,13].…”

Section: Introductionmentioning

confidence: 99%

Postural muscle activity patterns during standing at rest and on an oscillating floor

Fujiwara

Toyama

Kiyota

et al. 2006

Journal of Electromyography and Kinesiology

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Postural muscle activity pattern was examined in the eyes-closed state after adequate adaptation to floor anteroposterior oscillation. Twenty-three subjects were grouped almost evenly according to dominance of anterior or posterior postural muscles in the trunk and thigh during quiet stance. In the posterior-dominant group, this dominance was maintained at every frequency in most subjects. In the anterior-dominant group, this dominance was maintained in most subjects at 0.1 and 0.5Hz but changed to posterior dominance at 1.0 and 1.5 Hz in about half the subjects.Periodicity of muscle activity was evaluated by EMG amplitude spectrum at the floor oscillation frequency. Periodicity of posterior-dominant muscles in the trunk and thigh increased with increasing oscillatory frequency. In the trunk, the periodicity did not differ significantly between posterior-dominant and anterior-dominant groups. However, in the thigh, periodicity was significantly lower in the anterior-dominant muscles. This was considered to be caused by nonperiodic alternating action of the anterior and posterior muscles. In the lower leg, posterior dominance was observed in quiet stance and at all oscillation frequencies. Periodicity of soleus and gastrocnemius increased at higher frequencies and was higher in gastrocnemius than in soleus. The periodicity 5 10 15 2 difference between both muscles decreased with increasing oscillation frequency.3

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“…In our previous study (Fujiwara et al, 2003b), we investigated differences in changes in muscle activation of the biceps femoris and rectus femoris according to the CoPy position in subject groups who were divided based on QS position (Forward, Middle, and Backward groups). CoPys in QS for those groups were 52, 43, and 33%FL, respectively.…”

Section: Discussionmentioning

confidence: 99%

Relationship between Quiet Standing Position and Perceptibility of Standing Position in the Anteroposterior Direction

Fujiwara

Asai

Kiyota

et al. 2010

J Physiol Anthropol

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We investigated the relationship between an individual's center of pressure in the anteroposterior direction in quiet standing (QS) and perceptibility of different standing positions. The position of the center of pressure in the anteroposterior direction (CoPy position) while standing was represented as the percentage distance (%FL) from the hindmost point of the heel in relation to foot length. CoPy position in QS was located from 31 to 58%FL. Perceptibility of standing position was evaluated by the difference between the reference position and the subject's attempt to reproduce that position. Subjects were tested for their ability to reproduce reference positions selected randomly from a total of 13 positions at 5%FL increments from 20 to 80%FL. Using an approximation formula curve, we identified the relationship between reference position and reproduction absolute error. The standing position range with reproduction error exceeding 90% of the difference between the maximum and minimum errors was defined as the low perceptibility range of standing position. The approximation curve had one peak near QS. CoPy positions in QS were located in the low perceptibility range, except for five subjects with a more posterior location. The correlation coefficient between CoPy positions in QS (x) and reference position (y) showing maximum error was 0.70 and the regression line was yϭ0.464xϩ28.2; the intersection point with yϭx was 53%FL. Reproduction absolute errors in reference positions at 20-30%FL and 70-80%FL were significantly smaller than those at 40-60%FL (pϽ0.05). We concluded the following. (1) Standing positions showing the lowest perceptibility are located close to the QS position; however, in subjects whose QS position is located more posteriorly, the standing position showing maximum error is more anterior. (2) Perceptibility of extreme forward-and backward-leaning positions is very high and independent of individual QS position.

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Anticipatory activation of postural muscles associated with bilateral arm flexion in subjects with different quiet standing positions

Cited by 45 publications

References 37 publications

Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

Deficits in anticipatory inhibition of postural muscle activity associated with load release while standing in individuals with spastic diplegic cerebral palsy

Postural muscle activity patterns during standing at rest and on an oscillating floor

Relationship between Quiet Standing Position and Perceptibility of Standing Position in the Anteroposterior Direction

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